US20040008695A1 - Multi-bridge for a plurality of mutually different subnetworks - Google Patents

Multi-bridge for a plurality of mutually different subnetworks Download PDF

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Publication number
US20040008695A1
US20040008695A1 US10/615,568 US61556803A US2004008695A1 US 20040008695 A1 US20040008695 A1 US 20040008695A1 US 61556803 A US61556803 A US 61556803A US 2004008695 A1 US2004008695 A1 US 2004008695A1
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United States
Prior art keywords
vlan
bridge
ports
data packet
registered
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Abandoned
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US10/615,568
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English (en)
Inventor
Ronald Man
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nokia of America Corp
Original Assignee
Lucent Technologies Inc
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Publication date
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Assigned to LUCENT TECHNOLOGIES INC. reassignment LUCENT TECHNOLOGIES INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: DE MAN, RONALD
Publication of US20040008695A1 publication Critical patent/US20040008695A1/en
Abandoned legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/46—Interconnection of networks
    • H04L12/4641—Virtual LANs, VLANs, e.g. virtual private networks [VPN]
    • H04L12/467—Arrangements for supporting untagged frames, e.g. port-based VLANs
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/46—Interconnection of networks
    • H04L12/4604—LAN interconnection over a backbone network, e.g. Internet, Frame Relay
    • H04L12/462—LAN interconnection over a bridge based backbone
    • H04L12/4625—Single bridge functionality, e.g. connection of two networks over a single bridge

Definitions

  • the invention relates to a multi-bridge for use in a network that contains a plurality of subnetworks.
  • a network of communication links may be split into subnetworks.
  • a physical subnetwork usually is separated from other physical subnetworks for business or security reasons.
  • Each subnetwork comprises a number of bridges and a number of links, such as for instance Ethernet links.
  • Each bridge has a port for each link.
  • Each bridge is arranged to forward data packets which are received by a port of the bridge either via another port of the bridge to another bridge of the subnetwork, or, if possible, directly to a device with a destination address which is usually connected to one of the bridges.
  • the data packets comprise information related to the destination address, allowing for the correct forwarding of a data packet by a bridge.
  • Adjacent subnetworks may share a multi-bridge capable of forwarding data packets to ports for both subnetworks.
  • the multi-bridge comprises for each subnetwork a set of at least two ports.
  • VLANs Virtual Local Area Networks
  • data packets comprise information that identifies the VLAN over which the data packet is sent. This information is usually referred to as an identifier (VLAN ID).
  • VLAN ID an identifier
  • the multi-bridge is capable of extracting the VLAN ID from a data packet. This will enable the multi-bridge to forward a data packet not only via the correct port, but also via the correct VLAN.
  • VLANs with a given identifier may stop using one subnetwork and subsequently another VLAN with the same identification may start using another network. This may for instance be a result of the desire of customers to use another subnetwork.
  • the identifier of the VLAN is used to determine the ports of the multi-bridge to which the data packets are forwarded.
  • the multi-bridge registers for each VLAN to which ports data packets with the identifier of that VLAN must be forwarded.
  • the multi-bridge extracts the identifier and forwards the data packet according to the registered ports for that identifier.
  • the temporary nature of a VLAN on a subnetwork has consequences for the forwarding of a data packet. If a data packet comprises information related to the VLAN in which it has to be forwarded, conflicting information may be available to the bridge with regard to the port via which the data packet should be forwarded if an old identifier is used for a newly created VLAN . Therefore the registration must be updated.
  • the update of the registration of a VLAN may take place either manually, costing much time and energy or may take place by carrying out a highly complex protocol such as the GVRP protocol as described in IEEE 802.1q.
  • the invention provides a multi-bridge for a plurality of mutually different subnetworks.
  • This multi-bridge comprises for each subnetwork a set of at least two ports.
  • the multi-bridge is arranged to forward a data packet which is sent over a Virtual Local Area Network (VLAN) if the data packet is received by one of the at least two ports of the set on which that VLAN is registered.
  • VLAN Virtual Local Area Network
  • the multi-bridge is further arranged to register upon receiving a data packet by one of the at least two ports of a set, on each of the at least two ports of that set, if needed, the VLAN over which that data packet is sent.
  • the registration of a VLAN according to the invention comprises a simple and fast action. Use of a complex protocol such as the GVRP protocol is unnecessary.
  • the registration is strictly speaking only needed if the VLAN over which the data packet is sent has not already been registered on the set of at least two ports out of which by one port the data packet is received. It is however not excluded that the multi-bridge is arranged such that any data packet which is received by one port of a set needs to be registered on that set anyway.
  • the multi-bridge is further arranged to de-register on the at least two ports of each set that is different from the set of which one of the at least two ports has received the data packet, if needed, the VLAN over which that data packet is sent. This avoids multiple registration of a VLAN.
  • the multi-bridge is further arranged to provide an alarm signal if within a predetermined time span and by a predetermined number of times one VLAN is successively registered and de-registered on one set. This may for instance occur if after registration of a VLAN on a first set of at least two ports and de-registration of that VLAN on a second set of at least two ports, a data packet which is send over that VLAN still arrives at the second set of at least two ports.
  • the alarm signal which is then provided according to one aspect of the invention may comprise for instance a visual and or audible signal to an operator who can act appropriately.
  • the invention is further related to a network comprising such a bridge for a plurality of subnetworks.
  • the invention is also related to a method for allocating a Virtual Local Area Network (VLAN) to one set out of a number of such sets on a multi-bridge as described above.
  • VLAN Virtual Local Area Network
  • FIG. 1 schematically a communication network
  • FIG. 2 a flow chart of a first aspect of the method according to the invention
  • FIG. 3 a flow chart of a second aspect of the method according to the invention.
  • FIG. 4 a flow chart of a third aspect of the method according to the invention.
  • FIG. 1 shows a communication network with two subnetworks 1 and 2 .
  • Subnetwork 1 comprises the bridges B, C and multi-bridge A and links 4 . 1 between the bridges A, B, C and subnetwork 2 comprises the bridges D, E and multi-bridge A and links 4 . 2 between the bridges A, D, E.
  • the two subnetworks 1 , 2 share multi-bridge A.
  • Each bridge B,C of subnetwork 1 has two ports 3 . 1 for links 4 . 1 within subnetwork 1 .
  • Multi-bridge A has a set s 1 of two ports p. 1 . 1 , p. 1 . 2 for subnetwork 1 .
  • Each bridge D,E of subnetwork 2 has a port 3 . 2 for each link 4 . 2 within subnetwork 2 .
  • Multi-bridge A has a set s. 2 of two ports 3 . 2 . for subnetwork 2 .
  • data packets are sent via links 4 . 1 , 4 . 2 and bridges A,B,C,D,E through the network.
  • the bridges A,B, C, D, E in the network are arranged to support a plurality of Virtual Local Area Networks (VLANs).
  • VLANs Virtual Local Area Networks
  • Each VLAN behaves as an individual network, but the plurality of VLAN shares use of the bridges A, B, C, D, E and links 4 . 1 and 4 . 2 in the network.
  • Each VLAN is limited to a subnetwork.
  • Each VLAN has its own identifier VLAN ID. When a data packet is sent via a VLAN the identifier VLAN ID is included in the data packet.
  • Multi-bridge A registers for each identifier ID which subnetwork is used by the VLAN that corresponds to that ID.
  • Multi-bridge A is according to the invention arranged to carry out the method as schematically outlined in the flow-chart of FIG. 2.
  • VLAN Virtual Local Area Network
  • multi-bridge A determines that the VLAN ID has not been registered, multi-bridge A registers that the VLAN that corresponds to the VLAN ID from the data packet uses the subnetwork, i.e. the set of ports, that contains the port on which the packet was received, implying that the VLAN ID is registered at port p. 1 . 1 and port p. 1 . 2 .
  • the data packet which was sent over the VLAN with identifier ID and received at port p. 1 . 1 can then be forwarded by the multi-bridge via the port p. 1 . 2 onto which the VLAN with identifier ID is registered.
  • port p. 1 . 1 does not check whether the VLAN ID has been registered on set s 1 . In that case the VLAN ID is registered on set s 1 anyway, implying that the VLAN ID is registered on port p. 1 . 1 and port p 1 . 2 . This is shown by the broken line in FIG. 2
  • multi-bridge A may according to the invention be arranged to carry out the method as schematically outlined in the flow-chart of FIG. 3.
  • port p. 1 . 1 On receiving at one port p. 1 . 1 of the two ports p. 1 . 1 , p. 1 . 2 of set s 1 on multi-bridge A a data packet comprising a VLAN identity ID related to the Virtual Local Area Network (VLAN) over which it is sent, port p. 1 . 1 may check whether the VLAN ID has been registered at set s 2 which is different from set s 1 . If the VLAN ID has not been registered on set s 2 , no action is undertaken and the data packet is forwarded to p. 1 . 2 .
  • VLAN Virtual Local Area Network
  • the VLAN ID is de-registered on set s 2 , implying that the VLAN ID is de-registered at port p. 2 . 1 and port p. 2 . 2 . It may also be the case that port p. 1 . 1 does not check whether the VLAN ID has been registered on set 2 . In that case the VLAN ID is de-registered anyway on set 2 , implying that the VLAN ID is de-registered on port p. 2 . 1 and port p. 2 . 2 . This is shown by the broken line in FIG. 3
  • the order of checking registration on set s 1 and checking registration on set s 2 is irrelevant. Checking registration on set s 1 and checking on set s 2 may also occur simultaneously. The order of registration, if needed, and de-registration, if needed, is always such that de-registration does not take place after registration.
  • bridge A may be arranged to carry out the method as schematically outlined in the flow-chart of FIG. 4.
  • the number of times each VLAN ID is registered and de-registered on one set of two ports within a predetermined time span is monitored. If this number is higher than a predetermined number an alarm signal is provided to for instance an operator who can act appropriately. This signal may for example be a visual and/or audible signal.
  • the time is monitored in which the VLAN is registered and de-registered on one set of two ports by a predetermined number of times. If this time is shorter than a predetermined time, the alarm signal is provided.
  • a multi-bridge according to the invention may be arranged such that the forwarding of datapackets is carried out entirely and automatically by the hardware.
  • the registering and de-registering of a VLAN which may be seen as instructing the hardware, may be carried out by the software.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Small-Scale Networks (AREA)
US10/615,568 2002-07-09 2003-07-08 Multi-bridge for a plurality of mutually different subnetworks Abandoned US20040008695A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP02254806A EP1381189B1 (fr) 2002-07-09 2002-07-09 Passerelle multi-ports pour une pluralité de sous reseaux de types differents
EP02254806.9 2002-07-09

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US20040008695A1 true US20040008695A1 (en) 2004-01-15

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US (1) US20040008695A1 (fr)
EP (1) EP1381189B1 (fr)
DE (1) DE60206259T2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080205296A1 (en) * 2005-07-29 2008-08-28 Huawei Technologies Co., Ltd. VLAN-based data packet transmission and ethernet bridge device
US20130177022A1 (en) * 2012-01-05 2013-07-11 General Electric Company Dynamic Virtual LANs to Segregate Data

Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5892912A (en) * 1995-11-02 1999-04-06 The Furukawa Electric Co., Ltd. Method of managing virtual networks using a virtual network identifier
US5978378A (en) * 1997-09-11 1999-11-02 3Com Corporation Method and apparatus for VLAN support
US6061334A (en) * 1996-07-30 2000-05-09 Lucent Technologies Networks Ltd Apparatus and method for assigning virtual LANs to a switched network
US6101188A (en) * 1996-09-12 2000-08-08 Nec Corporation Internetworking router
US6223218B1 (en) * 1998-02-10 2001-04-24 Nec Corporation System and method for automatically setting VLAN configuration information
US6308218B1 (en) * 1997-09-17 2001-10-23 Sony Corporation Address look-up mechanism in a multi-port bridge for a local area network
US6400950B1 (en) * 1999-07-28 2002-06-04 Ericsson Inc. System and method for de-registration of multiple H.323 end points from a H.323 gatekeeper
US6560236B1 (en) * 1993-06-23 2003-05-06 Enterasys Networks, Inc. Virtual LANs
US6560227B1 (en) * 1998-02-23 2003-05-06 International Business Machines Corporation LAN frame copy decision for LAN switches
US6674713B1 (en) * 1999-02-23 2004-01-06 Cisco Technology, Inc. Method and apparatus for providing continuous voice and call communications between a data network and a telephony network
US20040037279A1 (en) * 2002-08-23 2004-02-26 David Zelig Virtual private LAN service using a multicast protocol
US20060221868A1 (en) * 2005-03-31 2006-10-05 De Heer Arie J Methods and apparatus for realizing a configurable multi-bridge
US20060251065A1 (en) * 2005-03-30 2006-11-09 Fujitsu Limited Network system having broadcast suppression function
US7180899B2 (en) * 2002-10-29 2007-02-20 Cisco Technology, Inc. Multi-tiered Virtual Local area Network (VLAN) domain mapping mechanism

Patent Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6560236B1 (en) * 1993-06-23 2003-05-06 Enterasys Networks, Inc. Virtual LANs
US5892912A (en) * 1995-11-02 1999-04-06 The Furukawa Electric Co., Ltd. Method of managing virtual networks using a virtual network identifier
US6061334A (en) * 1996-07-30 2000-05-09 Lucent Technologies Networks Ltd Apparatus and method for assigning virtual LANs to a switched network
US6101188A (en) * 1996-09-12 2000-08-08 Nec Corporation Internetworking router
US5978378A (en) * 1997-09-11 1999-11-02 3Com Corporation Method and apparatus for VLAN support
US6308218B1 (en) * 1997-09-17 2001-10-23 Sony Corporation Address look-up mechanism in a multi-port bridge for a local area network
US6223218B1 (en) * 1998-02-10 2001-04-24 Nec Corporation System and method for automatically setting VLAN configuration information
US6560227B1 (en) * 1998-02-23 2003-05-06 International Business Machines Corporation LAN frame copy decision for LAN switches
US6674713B1 (en) * 1999-02-23 2004-01-06 Cisco Technology, Inc. Method and apparatus for providing continuous voice and call communications between a data network and a telephony network
US6400950B1 (en) * 1999-07-28 2002-06-04 Ericsson Inc. System and method for de-registration of multiple H.323 end points from a H.323 gatekeeper
US20040037279A1 (en) * 2002-08-23 2004-02-26 David Zelig Virtual private LAN service using a multicast protocol
US7180899B2 (en) * 2002-10-29 2007-02-20 Cisco Technology, Inc. Multi-tiered Virtual Local area Network (VLAN) domain mapping mechanism
US20060251065A1 (en) * 2005-03-30 2006-11-09 Fujitsu Limited Network system having broadcast suppression function
US20060221868A1 (en) * 2005-03-31 2006-10-05 De Heer Arie J Methods and apparatus for realizing a configurable multi-bridge

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080205296A1 (en) * 2005-07-29 2008-08-28 Huawei Technologies Co., Ltd. VLAN-based data packet transmission and ethernet bridge device
US7756147B2 (en) * 2005-07-29 2010-07-13 Huawei Technologies Co., Ltd. VLAN-based data packet transmission and ethernet bridge device
US20130177022A1 (en) * 2012-01-05 2013-07-11 General Electric Company Dynamic Virtual LANs to Segregate Data

Also Published As

Publication number Publication date
EP1381189A1 (fr) 2004-01-14
EP1381189B1 (fr) 2005-09-21
DE60206259T2 (de) 2006-06-29
DE60206259D1 (de) 2005-10-27

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Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:DE MAN, RONALD;REEL/FRAME:014295/0309

Effective date: 20020808

STCB Information on status: application discontinuation

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